/*             ----> DO NOT REMOVE THE FOLLOWING NOTICE <----
 *
 *                 Copyright (c) 2014-2015 Datalight, Inc.
 *                     All Rights Reserved Worldwide.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; use version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but "AS-IS," WITHOUT ANY WARRANTY; without even the implied warranty
 *  of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*  Businesses and individuals that for commercial or other reasons cannot
 *  comply with the terms of the GPLv2 license may obtain a commercial license
 *  before incorporating Reliance Edge into proprietary software for
 *  distribution in any form.  Visit http://www.datalight.com/reliance-edge for
 *  more information.
 */

/** @file
 *  @brief Implements utilities for calculating CRC-32 checksums.
 */
#include <redfs.h>


/*  The CRC functions do not return errors since the only detectable error
 *  condition is a NULL buffer pointer.  If such a condition does arise, the
 *  functions assert and return the below CRC, which, although a legal CRC,
 *  is nonetheless suspicious and could provide a clue that something has
 *  gone wrong.
 */
#define SUSPICIOUS_CRC_VALUE    ( 0xBAADC0DEU )

#define CRC_BITWISE             ( 0U )
#define CRC_SARWATE             ( 1U )
#define CRC_SLICEBY8            ( 2U )


#if REDCONF_CRC_ALGORITHM == CRC_BITWISE

/*  The following is representative of the polynomial accepted by CCITT 32-bit
 *  and in IEEE 802.3, Ethernet 2 specification.
 *
 *  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1
 *     (reverse order)
 *  1110 1101 1011 1000 1000 0011 0010 0000 1
 *   (E)  (D)  (B)  (8)  (8)  (3)  (2)  (0)
 */
    #define CCITT_32_POLYNOMIAL    ( 0xEDB88320U )


/** @brief Compute a CRC32 for the given data buffer.
 *
 *  For CCITT-32 compliance, the initial CRC must be set to 0.  To CRC multiple
 *  buffers, call this function with the previously returned CRC value.
 *
 *  @param ulInitCrc32  Starting CRC value.
 *  @param pBuffer      Data buffer to calculate the CRC from.
 *  @param ulLength     Number of bytes of data in the given buffer.
 *
 *  @return The updated CRC value.
 */
    uint32_t RedCrc32Update( uint32_t ulInitCrc32,
                             const void * pBuffer,
                             uint32_t ulLength )
    {
        uint32_t ulCrc32;

        if( pBuffer == NULL )
        {
            REDERROR();
            ulCrc32 = SUSPICIOUS_CRC_VALUE;
        }
        else
        {
            const uint8_t * pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR( pBuffer );
            uint32_t ulIdx;

            ulCrc32 = ~ulInitCrc32;

            for( ulIdx = 0U; ulIdx < ulLength; ++ulIdx )
            {
                uint32_t ulBit;

                ulCrc32 ^= pbBuffer[ ulIdx ];

                /*  Branchless inner loop (greatly improves performance).
                 */
                for( ulBit = 0U; ulBit < 8U; ulBit++ )
                {
                    ulCrc32 = ( ( ulCrc32 & 1U ) * CCITT_32_POLYNOMIAL ) ^ ( ulCrc32 >> 1U );
                }
            }

            ulCrc32 = ~ulCrc32;
        }

        return ulCrc32;
    }

#elif REDCONF_CRC_ALGORITHM == CRC_SARWATE

/** @brief Compute a CRC32 for the given data buffer.
 *
 *  For CCITT-32 compliance, the initial CRC must be set to 0.  To CRC multiple
 *  buffers, call this function with the previously returned CRC value.
 *
 *  @param ulInitCrc32  Starting CRC value.
 *  @param pBuffer      Data buffer to calculate the CRC from.
 *  @param ulLength     Number of bytes of data in the given buffer.
 *
 *  @return The updated CRC value.
 */
    uint32_t RedCrc32Update( uint32_t ulInitCrc32,
                             const void * pBuffer,
                             uint32_t ulLength )
    {
        static const uint32_t aulCrc32Table[] =
        {
            0x00000000U, 0x77073096U, 0xEE0E612CU, 0x990951BAU, 0x076DC419U, 0x706AF48FU, 0xE963A535U, 0x9E6495A3U,
            0x0EDB8832U, 0x79DCB8A4U, 0xE0D5E91EU, 0x97D2D988U, 0x09B64C2BU, 0x7EB17CBDU, 0xE7B82D07U, 0x90BF1D91U,
            0x1DB71064U, 0x6AB020F2U, 0xF3B97148U, 0x84BE41DEU, 0x1ADAD47DU, 0x6DDDE4EBU, 0xF4D4B551U, 0x83D385C7U,
            0x136C9856U, 0x646BA8C0U, 0xFD62F97AU, 0x8A65C9ECU, 0x14015C4FU, 0x63066CD9U, 0xFA0F3D63U, 0x8D080DF5U,
            0x3B6E20C8U, 0x4C69105EU, 0xD56041E4U, 0xA2677172U, 0x3C03E4D1U, 0x4B04D447U, 0xD20D85FDU, 0xA50AB56BU,
            0x35B5A8FAU, 0x42B2986CU, 0xDBBBC9D6U, 0xACBCF940U, 0x32D86CE3U, 0x45DF5C75U, 0xDCD60DCFU, 0xABD13D59U,
            0x26D930ACU, 0x51DE003AU, 0xC8D75180U, 0xBFD06116U, 0x21B4F4B5U, 0x56B3C423U, 0xCFBA9599U, 0xB8BDA50FU,
            0x2802B89EU, 0x5F058808U, 0xC60CD9B2U, 0xB10BE924U, 0x2F6F7C87U, 0x58684C11U, 0xC1611DABU, 0xB6662D3DU,
            0x76DC4190U, 0x01DB7106U, 0x98D220BCU, 0xEFD5102AU, 0x71B18589U, 0x06B6B51FU, 0x9FBFE4A5U, 0xE8B8D433U,
            0x7807C9A2U, 0x0F00F934U, 0x9609A88EU, 0xE10E9818U, 0x7F6A0DBBU, 0x086D3D2DU, 0x91646C97U, 0xE6635C01U,
            0x6B6B51F4U, 0x1C6C6162U, 0x856530D8U, 0xF262004EU, 0x6C0695EDU, 0x1B01A57BU, 0x8208F4C1U, 0xF50FC457U,
            0x65B0D9C6U, 0x12B7E950U, 0x8BBEB8EAU, 0xFCB9887CU, 0x62DD1DDFU, 0x15DA2D49U, 0x8CD37CF3U, 0xFBD44C65U,
            0x4DB26158U, 0x3AB551CEU, 0xA3BC0074U, 0xD4BB30E2U, 0x4ADFA541U, 0x3DD895D7U, 0xA4D1C46DU, 0xD3D6F4FBU,
            0x4369E96AU, 0x346ED9FCU, 0xAD678846U, 0xDA60B8D0U, 0x44042D73U, 0x33031DE5U, 0xAA0A4C5FU, 0xDD0D7CC9U,
            0x5005713CU, 0x270241AAU, 0xBE0B1010U, 0xC90C2086U, 0x5768B525U, 0x206F85B3U, 0xB966D409U, 0xCE61E49FU,
            0x5EDEF90EU, 0x29D9C998U, 0xB0D09822U, 0xC7D7A8B4U, 0x59B33D17U, 0x2EB40D81U, 0xB7BD5C3BU, 0xC0BA6CADU,
            0xEDB88320U, 0x9ABFB3B6U, 0x03B6E20CU, 0x74B1D29AU, 0xEAD54739U, 0x9DD277AFU, 0x04DB2615U, 0x73DC1683U,
            0xE3630B12U, 0x94643B84U, 0x0D6D6A3EU, 0x7A6A5AA8U, 0xE40ECF0BU, 0x9309FF9DU, 0x0A00AE27U, 0x7D079EB1U,
            0xF00F9344U, 0x8708A3D2U, 0x1E01F268U, 0x6906C2FEU, 0xF762575DU, 0x806567CBU, 0x196C3671U, 0x6E6B06E7U,
            0xFED41B76U, 0x89D32BE0U, 0x10DA7A5AU, 0x67DD4ACCU, 0xF9B9DF6FU, 0x8EBEEFF9U, 0x17B7BE43U, 0x60B08ED5U,
            0xD6D6A3E8U, 0xA1D1937EU, 0x38D8C2C4U, 0x4FDFF252U, 0xD1BB67F1U, 0xA6BC5767U, 0x3FB506DDU, 0x48B2364BU,
            0xD80D2BDAU, 0xAF0A1B4CU, 0x36034AF6U, 0x41047A60U, 0xDF60EFC3U, 0xA867DF55U, 0x316E8EEFU, 0x4669BE79U,
            0xCB61B38CU, 0xBC66831AU, 0x256FD2A0U, 0x5268E236U, 0xCC0C7795U, 0xBB0B4703U, 0x220216B9U, 0x5505262FU,
            0xC5BA3BBEU, 0xB2BD0B28U, 0x2BB45A92U, 0x5CB36A04U, 0xC2D7FFA7U, 0xB5D0CF31U, 0x2CD99E8BU, 0x5BDEAE1DU,
            0x9B64C2B0U, 0xEC63F226U, 0x756AA39CU, 0x026D930AU, 0x9C0906A9U, 0xEB0E363FU, 0x72076785U, 0x05005713U,
            0x95BF4A82U, 0xE2B87A14U, 0x7BB12BAEU, 0x0CB61B38U, 0x92D28E9BU, 0xE5D5BE0DU, 0x7CDCEFB7U, 0x0BDBDF21U,
            0x86D3D2D4U, 0xF1D4E242U, 0x68DDB3F8U, 0x1FDA836EU, 0x81BE16CDU, 0xF6B9265BU, 0x6FB077E1U, 0x18B74777U,
            0x88085AE6U, 0xFF0F6A70U, 0x66063BCAU, 0x11010B5CU, 0x8F659EFFU, 0xF862AE69U, 0x616BFFD3U, 0x166CCF45U,
            0xA00AE278U, 0xD70DD2EEU, 0x4E048354U, 0x3903B3C2U, 0xA7672661U, 0xD06016F7U, 0x4969474DU, 0x3E6E77DBU,
            0xAED16A4AU, 0xD9D65ADCU, 0x40DF0B66U, 0x37D83BF0U, 0xA9BCAE53U, 0xDEBB9EC5U, 0x47B2CF7FU, 0x30B5FFE9U,
            0xBDBDF21CU, 0xCABAC28AU, 0x53B39330U, 0x24B4A3A6U, 0xBAD03605U, 0xCDD70693U, 0x54DE5729U, 0x23D967BFU,
            0xB3667A2EU, 0xC4614AB8U, 0x5D681B02U, 0x2A6F2B94U, 0xB40BBE37U, 0xC30C8EA1U, 0x5A05DF1BU, 0x2D02EF8DU,
        };

        uint32_t ulCrc32;

        if( pBuffer == NULL )
        {
            REDERROR();
            ulCrc32 = SUSPICIOUS_CRC_VALUE;
        }
        else
        {
            const uint8_t * pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR( pBuffer );
            uint32_t ulIdx;

            ulCrc32 = ~ulInitCrc32;

            for( ulIdx = 0U; ulIdx < ulLength; ++ulIdx )
            {
                ulCrc32 = ( ulCrc32 >> 8U ) ^ aulCrc32Table[ ( ulCrc32 ^ pbBuffer[ ulIdx ] ) & 0xFFU ];
            }

            ulCrc32 = ~ulCrc32;
        }

        return ulCrc32;
    }

#elif REDCONF_CRC_ALGORITHM == CRC_SLICEBY8


/** @brief Compute a CRC32 for the given data buffer.
 *
 *  For CCITT-32 compliance, the initial CRC must be set to 0.  To CRC multiple
 *  buffers, call this function with the previously returned CRC value.
 *
 *  @param ulInitCrc32  Starting CRC value.
 *  @param pBuffer      Data buffer to calculate the CRC from.
 *  @param ulLength     Number of bytes of data in the given buffer.
 *
 *  @return The updated CRC value.
 */
    uint32_t RedCrc32Update( uint32_t ulInitCrc32,
                             const void * pBuffer,
                             uint32_t ulLength )
    {
        /*  CRC32 XOR table, with slicing-by-8 extensions.
         *
         *  This first column of the table contains the same XOR values as used in
         *  the classic byte-at-a-time Sarwate algorithm.  The other seven columns
         *  are derived from the first, and are used in Intel's slicing-by-eight CRC
         *  algorithm.
         *
         *  The layout of this array in memory is novel and deserves explanation.
         *  In other implementations, including Intel's example, each of the below
         *  columns is an array.  The first column is a 256-entry array, followed by
         *  another 256-entry array for the second column, etc.  Testing on both ARM
         *  and x86 has shown the below mixed arrangement to be about 5-9% faster.
         *  One possible explanation: With the array-per-table approach, each of the
         *  eight table lookups is guaranteed to be in a separate 1 KB chunk of
         *  memory.  With the below array, sometimes multiple table lookups will, by
         *  coincidence, be close together, making better use of the cache.
         */
        static const uint32_t aulCrc32Table[] =
        {
            0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U, 0x00000000U,
            0x77073096U, 0x191B3141U, 0x01C26A37U, 0xB8BC6765U, 0x3D6029B0U, 0xCB5CD3A5U, 0xA6770BB4U, 0xCCAA009EU,
            0xEE0E612CU, 0x32366282U, 0x0384D46EU, 0xAA09C88BU, 0x7AC05360U, 0x4DC8A10BU, 0x979F1129U, 0x4225077DU,
            0x990951BAU, 0x2B2D53C3U, 0x0246BE59U, 0x12B5AFEEU, 0x47A07AD0U, 0x869472AEU, 0x31E81A9DU, 0x8E8F07E3U,
            0x076DC419U, 0x646CC504U, 0x0709A8DCU, 0x8F629757U, 0xF580A6C0U, 0x9B914216U, 0xF44F2413U, 0x844A0EFAU,
            0x706AF48FU, 0x7D77F445U, 0x06CBC2EBU, 0x37DEF032U, 0xC8E08F70U, 0x50CD91B3U, 0x52382FA7U, 0x48E00E64U,
            0xE963A535U, 0x565AA786U, 0x048D7CB2U, 0x256B5FDCU, 0x8F40F5A0U, 0xD659E31DU, 0x63D0353AU, 0xC66F0987U,
            0x9E6495A3U, 0x4F4196C7U, 0x054F1685U, 0x9DD738B9U, 0xB220DC10U, 0x1D0530B8U, 0xC5A73E8EU, 0x0AC50919U,
            0x0EDB8832U, 0xC8D98A08U, 0x0E1351B8U, 0xC5B428EFU, 0x30704BC1U, 0xEC53826DU, 0x33EF4E67U, 0xD3E51BB5U,
            0x79DCB8A4U, 0xD1C2BB49U, 0x0FD13B8FU, 0x7D084F8AU, 0x0D106271U, 0x270F51C8U, 0x959845D3U, 0x1F4F1B2BU,
            0xE0D5E91EU, 0xFAEFE88AU, 0x0D9785D6U, 0x6FBDE064U, 0x4AB018A1U, 0xA19B2366U, 0xA4705F4EU, 0x91C01CC8U,
            0x97D2D988U, 0xE3F4D9CBU, 0x0C55EFE1U, 0xD7018701U, 0x77D03111U, 0x6AC7F0C3U, 0x020754FAU, 0x5D6A1C56U,
            0x09B64C2BU, 0xACB54F0CU, 0x091AF964U, 0x4AD6BFB8U, 0xC5F0ED01U, 0x77C2C07BU, 0xC7A06A74U, 0x57AF154FU,
            0x7EB17CBDU, 0xB5AE7E4DU, 0x08D89353U, 0xF26AD8DDU, 0xF890C4B1U, 0xBC9E13DEU, 0x61D761C0U, 0x9B0515D1U,
            0xE7B82D07U, 0x9E832D8EU, 0x0A9E2D0AU, 0xE0DF7733U, 0xBF30BE61U, 0x3A0A6170U, 0x503F7B5DU, 0x158A1232U,
            0x90BF1D91U, 0x87981CCFU, 0x0B5C473DU, 0x58631056U, 0x825097D1U, 0xF156B2D5U, 0xF64870E9U, 0xD92012ACU,
            0x1DB71064U, 0x4AC21251U, 0x1C26A370U, 0x5019579FU, 0x60E09782U, 0x03D6029BU, 0x67DE9CCEU, 0x7CBB312BU,
            0x6AB020F2U, 0x53D92310U, 0x1DE4C947U, 0xE8A530FAU, 0x5D80BE32U, 0xC88AD13EU, 0xC1A9977AU, 0xB01131B5U,
            0xF3B97148U, 0x78F470D3U, 0x1FA2771EU, 0xFA109F14U, 0x1A20C4E2U, 0x4E1EA390U, 0xF0418DE7U, 0x3E9E3656U,
            0x84BE41DEU, 0x61EF4192U, 0x1E601D29U, 0x42ACF871U, 0x2740ED52U, 0x85427035U, 0x56368653U, 0xF23436C8U,
            0x1ADAD47DU, 0x2EAED755U, 0x1B2F0BACU, 0xDF7BC0C8U, 0x95603142U, 0x9847408DU, 0x9391B8DDU, 0xF8F13FD1U,
            0x6DDDE4EBU, 0x37B5E614U, 0x1AED619BU, 0x67C7A7ADU, 0xA80018F2U, 0x531B9328U, 0x35E6B369U, 0x345B3F4FU,
            0xF4D4B551U, 0x1C98B5D7U, 0x18ABDFC2U, 0x75720843U, 0xEFA06222U, 0xD58FE186U, 0x040EA9F4U, 0xBAD438ACU,
            0x83D385C7U, 0x05838496U, 0x1969B5F5U, 0xCDCE6F26U, 0xD2C04B92U, 0x1ED33223U, 0xA279A240U, 0x767E3832U,
            0x136C9856U, 0x821B9859U, 0x1235F2C8U, 0x95AD7F70U, 0x5090DC43U, 0xEF8580F6U, 0x5431D2A9U, 0xAF5E2A9EU,
            0x646BA8C0U, 0x9B00A918U, 0x13F798FFU, 0x2D111815U, 0x6DF0F5F3U, 0x24D95353U, 0xF246D91DU, 0x63F42A00U,
            0xFD62F97AU, 0xB02DFADBU, 0x11B126A6U, 0x3FA4B7FBU, 0x2A508F23U, 0xA24D21FDU, 0xC3AEC380U, 0xED7B2DE3U,
            0x8A65C9ECU, 0xA936CB9AU, 0x10734C91U, 0x8718D09EU, 0x1730A693U, 0x6911F258U, 0x65D9C834U, 0x21D12D7DU,
            0x14015C4FU, 0xE6775D5DU, 0x153C5A14U, 0x1ACFE827U, 0xA5107A83U, 0x7414C2E0U, 0xA07EF6BAU, 0x2B142464U,
            0x63066CD9U, 0xFF6C6C1CU, 0x14FE3023U, 0xA2738F42U, 0x98705333U, 0xBF481145U, 0x0609FD0EU, 0xE7BE24FAU,
            0xFA0F3D63U, 0xD4413FDFU, 0x16B88E7AU, 0xB0C620ACU, 0xDFD029E3U, 0x39DC63EBU, 0x37E1E793U, 0x69312319U,
            0x8D080DF5U, 0xCD5A0E9EU, 0x177AE44DU, 0x087A47C9U, 0xE2B00053U, 0xF280B04EU, 0x9196EC27U, 0xA59B2387U,
            0x3B6E20C8U, 0x958424A2U, 0x384D46E0U, 0xA032AF3EU, 0xC1C12F04U, 0x07AC0536U, 0xCFBD399CU, 0xF9766256U,
            0x4C69105EU, 0x8C9F15E3U, 0x398F2CD7U, 0x188EC85BU, 0xFCA106B4U, 0xCCF0D693U, 0x69CA3228U, 0x35DC62C8U,
            0xD56041E4U, 0xA7B24620U, 0x3BC9928EU, 0x0A3B67B5U, 0xBB017C64U, 0x4A64A43DU, 0x582228B5U, 0xBB53652BU,
            0xA2677172U, 0xBEA97761U, 0x3A0BF8B9U, 0xB28700D0U, 0x866155D4U, 0x81387798U, 0xFE552301U, 0x77F965B5U,
            0x3C03E4D1U, 0xF1E8E1A6U, 0x3F44EE3CU, 0x2F503869U, 0x344189C4U, 0x9C3D4720U, 0x3BF21D8FU, 0x7D3C6CACU,
            0x4B04D447U, 0xE8F3D0E7U, 0x3E86840BU, 0x97EC5F0CU, 0x0921A074U, 0x57619485U, 0x9D85163BU, 0xB1966C32U,
            0xD20D85FDU, 0xC3DE8324U, 0x3CC03A52U, 0x8559F0E2U, 0x4E81DAA4U, 0xD1F5E62BU, 0xAC6D0CA6U, 0x3F196BD1U,
            0xA50AB56BU, 0xDAC5B265U, 0x3D025065U, 0x3DE59787U, 0x73E1F314U, 0x1AA9358EU, 0x0A1A0712U, 0xF3B36B4FU,
            0x35B5A8FAU, 0x5D5DAEAAU, 0x365E1758U, 0x658687D1U, 0xF1B164C5U, 0xEBFF875BU, 0xFC5277FBU, 0x2A9379E3U,
            0x42B2986CU, 0x44469FEBU, 0x379C7D6FU, 0xDD3AE0B4U, 0xCCD14D75U, 0x20A354FEU, 0x5A257C4FU, 0xE639797DU,
            0xDBBBC9D6U, 0x6F6BCC28U, 0x35DAC336U, 0xCF8F4F5AU, 0x8B7137A5U, 0xA6372650U, 0x6BCD66D2U, 0x68B67E9EU,
            0xACBCF940U, 0x7670FD69U, 0x3418A901U, 0x7733283FU, 0xB6111E15U, 0x6D6BF5F5U, 0xCDBA6D66U, 0xA41C7E00U,
            0x32D86CE3U, 0x39316BAEU, 0x3157BF84U, 0xEAE41086U, 0x0431C205U, 0x706EC54DU, 0x081D53E8U, 0xAED97719U,
            0x45DF5C75U, 0x202A5AEFU, 0x3095D5B3U, 0x525877E3U, 0x3951EBB5U, 0xBB3216E8U, 0xAE6A585CU, 0x62737787U,
            0xDCD60DCFU, 0x0B07092CU, 0x32D36BEAU, 0x40EDD80DU, 0x7EF19165U, 0x3DA66446U, 0x9F8242C1U, 0xECFC7064U,
            0xABD13D59U, 0x121C386DU, 0x331101DDU, 0xF851BF68U, 0x4391B8D5U, 0xF6FAB7E3U, 0x39F54975U, 0x205670FAU,
            0x26D930ACU, 0xDF4636F3U, 0x246BE590U, 0xF02BF8A1U, 0xA121B886U, 0x047A07ADU, 0xA863A552U, 0x85CD537DU,
            0x51DE003AU, 0xC65D07B2U, 0x25A98FA7U, 0x48979FC4U, 0x9C419136U, 0xCF26D408U, 0x0E14AEE6U, 0x496753E3U,
            0xC8D75180U, 0xED705471U, 0x27EF31FEU, 0x5A22302AU, 0xDBE1EBE6U, 0x49B2A6A6U, 0x3FFCB47BU, 0xC7E85400U,
            0xBFD06116U, 0xF46B6530U, 0x262D5BC9U, 0xE29E574FU, 0xE681C256U, 0x82EE7503U, 0x998BBFCFU, 0x0B42549EU,
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            0x38D8C2C4U, 0x9C31DE6BU, 0xDAFC890EU, 0xE762D18EU, 0x0AE7CCF6U, 0x54D4B0E5U, 0xD034C247U, 0xE868E0F1U,
            0x4FDFF252U, 0x852AEF2AU, 0xDB3EE339U, 0x5FDEB6EBU, 0x3787E546U, 0x9F886340U, 0x7643C9F3U, 0x24C2E06FU,
            0xD1BB67F1U, 0xCA6B79EDU, 0xDE71F5BCU, 0xC2098E52U, 0x85A73956U, 0x828D53F8U, 0xB3E4F77DU, 0x2E07E976U,
            0xA6BC5767U, 0xD37048ACU, 0xDFB39F8BU, 0x7AB5E937U, 0xB8C710E6U, 0x49D1805DU, 0x1593FCC9U, 0xE2ADE9E8U,
            0x3FB506DDU, 0xF85D1B6FU, 0xDDF521D2U, 0x680046D9U, 0xFF676A36U, 0xCF45F2F3U, 0x247BE654U, 0x6C22EE0BU,
            0x48B2364BU, 0xE1462A2EU, 0xDC374BE5U, 0xD0BC21BCU, 0xC2074386U, 0x04192156U, 0x820CEDE0U, 0xA088EE95U,
            0xD80D2BDAU, 0x66DE36E1U, 0xD76B0CD8U, 0x88DF31EAU, 0x4057D457U, 0xF54F9383U, 0x74449D09U, 0x79A8FC39U,
            0xAF0A1B4CU, 0x7FC507A0U, 0xD6A966EFU, 0x3063568FU, 0x7D37FDE7U, 0x3E134026U, 0xD23396BDU, 0xB502FCA7U,
            0x36034AF6U, 0x54E85463U, 0xD4EFD8B6U, 0x22D6F961U, 0x3A978737U, 0xB8873288U, 0xE3DB8C20U, 0x3B8DFB44U,
            0x41047A60U, 0x4DF36522U, 0xD52DB281U, 0x9A6A9E04U, 0x07F7AE87U, 0x73DBE12DU, 0x45AC8794U, 0xF727FBDAU,
            0xDF60EFC3U, 0x02B2F3E5U, 0xD062A404U, 0x07BDA6BDU, 0xB5D77297U, 0x6EDED195U, 0x800BB91AU, 0xFDE2F2C3U,
            0xA867DF55U, 0x1BA9C2A4U, 0xD1A0CE33U, 0xBF01C1D8U, 0x88B75B27U, 0xA5820230U, 0x267CB2AEU, 0x3148F25DU,
            0x316E8EEFU, 0x30849167U, 0xD3E6706AU, 0xADB46E36U, 0xCF1721F7U, 0x2316709EU, 0x1794A833U, 0xBFC7F5BEU,
            0x4669BE79U, 0x299FA026U, 0xD2241A5DU, 0x15080953U, 0xF2770847U, 0xE84AA33BU, 0xB1E3A387U, 0x736DF520U,
            0xCB61B38CU, 0xE4C5AEB8U, 0xC55EFE10U, 0x1D724E9AU, 0x10C70814U, 0x1ACA1375U, 0x20754FA0U, 0xD6F6D6A7U,
            0xBC66831AU, 0xFDDE9FF9U, 0xC49C9427U, 0xA5CE29FFU, 0x2DA721A4U, 0xD196C0D0U, 0x86024414U, 0x1A5CD639U,
            0x256FD2A0U, 0xD6F3CC3AU, 0xC6DA2A7EU, 0xB77B8611U, 0x6A075B74U, 0x5702B27EU, 0xB7EA5E89U, 0x94D3D1DAU,
            0x5268E236U, 0xCFE8FD7BU, 0xC7184049U, 0x0FC7E174U, 0x576772C4U, 0x9C5E61DBU, 0x119D553DU, 0x5879D144U,
            0xCC0C7795U, 0x80A96BBCU, 0xC25756CCU, 0x9210D9CDU, 0xE547AED4U, 0x815B5163U, 0xD43A6BB3U, 0x52BCD85DU,
            0xBB0B4703U, 0x99B25AFDU, 0xC3953CFBU, 0x2AACBEA8U, 0xD8278764U, 0x4A0782C6U, 0x724D6007U, 0x9E16D8C3U,
            0x220216B9U, 0xB29F093EU, 0xC1D382A2U, 0x38191146U, 0x9F87FDB4U, 0xCC93F068U, 0x43A57A9AU, 0x1099DF20U,
            0x5505262FU, 0xAB84387FU, 0xC011E895U, 0x80A57623U, 0xA2E7D404U, 0x07CF23CDU, 0xE5D2712EU, 0xDC33DFBEU,
            0xC5BA3BBEU, 0x2C1C24B0U, 0xCB4DAFA8U, 0xD8C66675U, 0x20B743D5U, 0xF6999118U, 0x139A01C7U, 0x0513CD12U,
            0xB2BD0B28U, 0x350715F1U, 0xCA8FC59FU, 0x607A0110U, 0x1DD76A65U, 0x3DC542BDU, 0xB5ED0A73U, 0xC9B9CD8CU,
            0x2BB45A92U, 0x1E2A4632U, 0xC8C97BC6U, 0x72CFAEFEU, 0x5A7710B5U, 0xBB513013U, 0x840510EEU, 0x4736CA6FU,
            0x5CB36A04U, 0x07317773U, 0xC90B11F1U, 0xCA73C99BU, 0x67173905U, 0x700DE3B6U, 0x22721B5AU, 0x8B9CCAF1U,
            0xC2D7FFA7U, 0x4870E1B4U, 0xCC440774U, 0x57A4F122U, 0xD537E515U, 0x6D08D30EU, 0xE7D525D4U, 0x8159C3E8U,
            0xB5D0CF31U, 0x516BD0F5U, 0xCD866D43U, 0xEF189647U, 0xE857CCA5U, 0xA65400ABU, 0x41A22E60U, 0x4DF3C376U,
            0x2CD99E8BU, 0x7A468336U, 0xCFC0D31AU, 0xFDAD39A9U, 0xAFF7B675U, 0x20C07205U, 0x704A34FDU, 0xC37CC495U,
            0x5BDEAE1DU, 0x635DB277U, 0xCE02B92DU, 0x45115ECCU, 0x92979FC5U, 0xEB9CA1A0U, 0xD63D3F49U, 0x0FD6C40BU,
            0x9B64C2B0U, 0xCBFAD74EU, 0x91AF9640U, 0x764DEE06U, 0xE915E8DBU, 0x11E81EB4U, 0xCC1D9F8BU, 0x7AA64737U,
            0xEC63F226U, 0xD2E1E60FU, 0x906DFC77U, 0xCEF18963U, 0xD475C16BU, 0xDAB4CD11U, 0x6A6A943FU, 0xB60C47A9U,
            0x756AA39CU, 0xF9CCB5CCU, 0x922B422EU, 0xDC44268DU, 0x93D5BBBBU, 0x5C20BFBFU, 0x5B828EA2U, 0x3883404AU,
            0x026D930AU, 0xE0D7848DU, 0x93E92819U, 0x64F841E8U, 0xAEB5920BU, 0x977C6C1AU, 0xFDF58516U, 0xF42940D4U,
            0x9C0906A9U, 0xAF96124AU, 0x96A63E9CU, 0xF92F7951U, 0x1C954E1BU, 0x8A795CA2U, 0x3852BB98U, 0xFEEC49CDU,
            0xEB0E363FU, 0xB68D230BU, 0x976454ABU, 0x41931E34U, 0x21F567ABU, 0x41258F07U, 0x9E25B02CU, 0x32464953U,
            0x72076785U, 0x9DA070C8U, 0x9522EAF2U, 0x5326B1DAU, 0x66551D7BU, 0xC7B1FDA9U, 0xAFCDAAB1U, 0xBCC94EB0U,
            0x05005713U, 0x84BB4189U, 0x94E080C5U, 0xEB9AD6BFU, 0x5B3534CBU, 0x0CED2E0CU, 0x09BAA105U, 0x70634E2EU,
            0x95BF4A82U, 0x03235D46U, 0x9FBCC7F8U, 0xB3F9C6E9U, 0xD965A31AU, 0xFDBB9CD9U, 0xFFF2D1ECU, 0xA9435C82U,
            0xE2B87A14U, 0x1A386C07U, 0x9E7EADCFU, 0x0B45A18CU, 0xE4058AAAU, 0x36E74F7CU, 0x5985DA58U, 0x65E95C1CU,
            0x7BB12BAEU, 0x31153FC4U, 0x9C381396U, 0x19F00E62U, 0xA3A5F07AU, 0xB0733DD2U, 0x686DC0C5U, 0xEB665BFFU,
            0x0CB61B38U, 0x280E0E85U, 0x9DFA79A1U, 0xA14C6907U, 0x9EC5D9CAU, 0x7B2FEE77U, 0xCE1ACB71U, 0x27CC5B61U,
            0x92D28E9BU, 0x674F9842U, 0x98B56F24U, 0x3C9B51BEU, 0x2CE505DAU, 0x662ADECFU, 0x0BBDF5FFU, 0x2D095278U,
            0xE5D5BE0DU, 0x7E54A903U, 0x99770513U, 0x842736DBU, 0x11852C6AU, 0xAD760D6AU, 0xADCAFE4BU, 0xE1A352E6U,
            0x7CDCEFB7U, 0x5579FAC0U, 0x9B31BB4AU, 0x96929935U, 0x562556BAU, 0x2BE27FC4U, 0x9C22E4D6U, 0x6F2C5505U,
            0x0BDBDF21U, 0x4C62CB81U, 0x9AF3D17DU, 0x2E2EFE50U, 0x6B457F0AU, 0xE0BEAC61U, 0x3A55EF62U, 0xA386559BU,
            0x86D3D2D4U, 0x8138C51FU, 0x8D893530U, 0x2654B999U, 0x89F57F59U, 0x123E1C2FU, 0xABC30345U, 0x061D761CU,
            0xF1D4E242U, 0x9823F45EU, 0x8C4B5F07U, 0x9EE8DEFCU, 0xB49556E9U, 0xD962CF8AU, 0x0DB408F1U, 0xCAB77682U,
            0x68DDB3F8U, 0xB30EA79DU, 0x8E0DE15EU, 0x8C5D7112U, 0xF3352C39U, 0x5FF6BD24U, 0x3C5C126CU, 0x44387161U,
            0x1FDA836EU, 0xAA1596DCU, 0x8FCF8B69U, 0x34E11677U, 0xCE550589U, 0x94AA6E81U, 0x9A2B19D8U, 0x889271FFU,
            0x81BE16CDU, 0xE554001BU, 0x8A809DECU, 0xA9362ECEU, 0x7C75D999U, 0x89AF5E39U, 0x5F8C2756U, 0x825778E6U,
            0xF6B9265BU, 0xFC4F315AU, 0x8B42F7DBU, 0x118A49ABU, 0x4115F029U, 0x42F38D9CU, 0xF9FB2CE2U, 0x4EFD7878U,
            0x6FB077E1U, 0xD7626299U, 0x89044982U, 0x033FE645U, 0x06B58AF9U, 0xC467FF32U, 0xC813367FU, 0xC0727F9BU,
            0x18B74777U, 0xCE7953D8U, 0x88C623B5U, 0xBB838120U, 0x3BD5A349U, 0x0F3B2C97U, 0x6E643DCBU, 0x0CD87F05U,
            0x88085AE6U, 0x49E14F17U, 0x839A6488U, 0xE3E09176U, 0xB9853498U, 0xFE6D9E42U, 0x982C4D22U, 0xD5F86DA9U,
            0xFF0F6A70U, 0x50FA7E56U, 0x82580EBFU, 0x5B5CF613U, 0x84E51D28U, 0x35314DE7U, 0x3E5B4696U, 0x19526D37U,
            0x66063BCAU, 0x7BD72D95U, 0x801EB0E6U, 0x49E959FDU, 0xC34567F8U, 0xB3A53F49U, 0x0FB35C0BU, 0x97DD6AD4U,
            0x11010B5CU, 0x62CC1CD4U, 0x81DCDAD1U, 0xF1553E98U, 0xFE254E48U, 0x78F9ECECU, 0xA9C457BFU, 0x5B776A4AU,
            0x8F659EFFU, 0x2D8D8A13U, 0x8493CC54U, 0x6C820621U, 0x4C059258U, 0x65FCDC54U, 0x6C636931U, 0x51B26353U,
            0xF862AE69U, 0x3496BB52U, 0x8551A663U, 0xD43E6144U, 0x7165BBE8U, 0xAEA00FF1U, 0xCA146285U, 0x9D1863CDU,
            0x616BFFD3U, 0x1FBBE891U, 0x8717183AU, 0xC68BCEAAU, 0x36C5C138U, 0x28347D5FU, 0xFBFC7818U, 0x1397642EU,
            0x166CCF45U, 0x06A0D9D0U, 0x86D5720DU, 0x7E37A9CFU, 0x0BA5E888U, 0xE368AEFAU, 0x5D8B73ACU, 0xDF3D64B0U,
            0xA00AE278U, 0x5E7EF3ECU, 0xA9E2D0A0U, 0xD67F4138U, 0x28D4C7DFU, 0x16441B82U, 0x03A0A617U, 0x83D02561U,
            0xD70DD2EEU, 0x4765C2ADU, 0xA820BA97U, 0x6EC3265DU, 0x15B4EE6FU, 0xDD18C827U, 0xA5D7ADA3U, 0x4F7A25FFU,
            0x4E048354U, 0x6C48916EU, 0xAA6604CEU, 0x7C7689B3U, 0x521494BFU, 0x5B8CBA89U, 0x943FB73EU, 0xC1F5221CU,
            0x3903B3C2U, 0x7553A02FU, 0xABA46EF9U, 0xC4CAEED6U, 0x6F74BD0FU, 0x90D0692CU, 0x3248BC8AU, 0x0D5F2282U,
            0xA7672661U, 0x3A1236E8U, 0xAEEB787CU, 0x591DD66FU, 0xDD54611FU, 0x8DD55994U, 0xF7EF8204U, 0x079A2B9BU,
            0xD06016F7U, 0x230907A9U, 0xAF29124BU, 0xE1A1B10AU, 0xE03448AFU, 0x46898A31U, 0x519889B0U, 0xCB302B05U,
            0x4969474DU, 0x0824546AU, 0xAD6FAC12U, 0xF3141EE4U, 0xA794327FU, 0xC01DF89FU, 0x6070932DU, 0x45BF2CE6U,
            0x3E6E77DBU, 0x113F652BU, 0xACADC625U, 0x4BA87981U, 0x9AF41BCFU, 0x0B412B3AU, 0xC6079899U, 0x89152C78U,
            0xAED16A4AU, 0x96A779E4U, 0xA7F18118U, 0x13CB69D7U, 0x18A48C1EU, 0xFA1799EFU, 0x304FE870U, 0x50353ED4U,
            0xD9D65ADCU, 0x8FBC48A5U, 0xA633EB2FU, 0xAB770EB2U, 0x25C4A5AEU, 0x314B4A4AU, 0x9638E3C4U, 0x9C9F3E4AU,
            0x40DF0B66U, 0xA4911B66U, 0xA4755576U, 0xB9C2A15CU, 0x6264DF7EU, 0xB7DF38E4U, 0xA7D0F959U, 0x121039A9U,
            0x37D83BF0U, 0xBD8A2A27U, 0xA5B73F41U, 0x017EC639U, 0x5F04F6CEU, 0x7C83EB41U, 0x01A7F2EDU, 0xDEBA3937U,
            0xA9BCAE53U, 0xF2CBBCE0U, 0xA0F829C4U, 0x9CA9FE80U, 0xED242ADEU, 0x6186DBF9U, 0xC400CC63U, 0xD47F302EU,
            0xDEBB9EC5U, 0xEBD08DA1U, 0xA13A43F3U, 0x241599E5U, 0xD044036EU, 0xAADA085CU, 0x6277C7D7U, 0x18D530B0U,
            0x47B2CF7FU, 0xC0FDDE62U, 0xA37CFDAAU, 0x36A0360BU, 0x97E479BEU, 0x2C4E7AF2U, 0x539FDD4AU, 0x965A3753U,
            0x30B5FFE9U, 0xD9E6EF23U, 0xA2BE979DU, 0x8E1C516EU, 0xAA84500EU, 0xE712A957U, 0xF5E8D6FEU, 0x5AF037CDU,
            0xBDBDF21CU, 0x14BCE1BDU, 0xB5C473D0U, 0x866616A7U, 0x4834505DU, 0x15921919U, 0x647E3AD9U, 0xFF6B144AU,
            0xCABAC28AU, 0x0DA7D0FCU, 0xB40619E7U, 0x3EDA71C2U, 0x755479EDU, 0xDECECABCU, 0xC209316DU, 0x33C114D4U,
            0x53B39330U, 0x268A833FU, 0xB640A7BEU, 0x2C6FDE2CU, 0x32F4033DU, 0x585AB812U, 0xF3E12BF0U, 0xBD4E1337U,
            0x24B4A3A6U, 0x3F91B27EU, 0xB782CD89U, 0x94D3B949U, 0x0F942A8DU, 0x93066BB7U, 0x55962044U, 0x71E413A9U,
            0xBAD03605U, 0x70D024B9U, 0xB2CDDB0CU, 0x090481F0U, 0xBDB4F69DU, 0x8E035B0FU, 0x90311ECAU, 0x7B211AB0U,
            0xCDD70693U, 0x69CB15F8U, 0xB30FB13BU, 0xB1B8E695U, 0x80D4DF2DU, 0x455F88AAU, 0x3646157EU, 0xB78B1A2EU,
            0x54DE5729U, 0x42E6463BU, 0xB1490F62U, 0xA30D497BU, 0xC774A5FDU, 0xC3CBFA04U, 0x07AE0FE3U, 0x39041DCDU,
            0x23D967BFU, 0x5BFD777AU, 0xB08B6555U, 0x1BB12E1EU, 0xFA148C4DU, 0x089729A1U, 0xA1D90457U, 0xF5AE1D53U,
            0xB3667A2EU, 0xDC656BB5U, 0xBBD72268U, 0x43D23E48U, 0x78441B9CU, 0xF9C19B74U, 0x579174BEU, 0x2C8E0FFFU,
            0xC4614AB8U, 0xC57E5AF4U, 0xBA15485FU, 0xFB6E592DU, 0x4524322CU, 0x329D48D1U, 0xF1E67F0AU, 0xE0240F61U,
            0x5D681B02U, 0xEE530937U, 0xB853F606U, 0xE9DBF6C3U, 0x028448FCU, 0xB4093A7FU, 0xC00E6597U, 0x6EAB0882U,
            0x2A6F2B94U, 0xF7483876U, 0xB9919C31U, 0x516791A6U, 0x3FE4614CU, 0x7F55E9DAU, 0x66796E23U, 0xA201081CU,
            0xB40BBE37U, 0xB809AEB1U, 0xBCDE8AB4U, 0xCCB0A91FU, 0x8DC4BD5CU, 0x6250D962U, 0xA3DE50ADU, 0xA8C40105U,
            0xC30C8EA1U, 0xA1129FF0U, 0xBD1CE083U, 0x740CCE7AU, 0xB0A494ECU, 0xA90C0AC7U, 0x05A95B19U, 0x646E019BU,
            0x5A05DF1BU, 0x8A3FCC33U, 0xBF5A5EDAU, 0x66B96194U, 0xF704EE3CU, 0x2F987869U, 0x34414184U, 0xEAE10678U,
            0x2D02EF8DU, 0x9324FD72U, 0xBE9834EDU, 0xDE0506F1U, 0xCA64C78CU, 0xE4C4ABCCU, 0x92364A30U, 0x264B06E6U,
        };

        uint32_t ulCrc32;

        if( pBuffer == NULL )
        {
            REDERROR();
            ulCrc32 = SUSPICIOUS_CRC_VALUE;
        }
        else
        {
            const uint8_t * pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR( pBuffer );
            uint32_t ulIdx = 0U;
            const uint32_t * pulXorCrc0 = &aulCrc32Table[ 7U ];
            const uint32_t * pulXorCrc1 = &aulCrc32Table[ 6U ];
            const uint32_t * pulXorCrc2 = &aulCrc32Table[ 5U ];
            const uint32_t * pulXorCrc3 = &aulCrc32Table[ 4U ];
            const uint32_t * pulXorData4 = &aulCrc32Table[ 3U ];
            const uint32_t * pulXorData5 = &aulCrc32Table[ 2U ];
            const uint32_t * pulXorData6 = &aulCrc32Table[ 1U ];
            const uint32_t * pulXorData7 = &aulCrc32Table[ 0U ];
            uint32_t ulSliceLen;

            ulCrc32 = ~ulInitCrc32;

            /*  Aligned memory access is used below.  To avoid suboptimal
             *  performance and faults (depending on platform), handle the
             *  unaligned initial bytes (if any) using the Sarwate algorithm.
             */
            while( ( ulIdx < ulLength ) && !IS_ALIGNED_PTR( &pbBuffer[ ulIdx ] ) )
            {
                ulCrc32 = ( ulCrc32 >> 8U ) ^ aulCrc32Table[ ( ( ulCrc32 ^ pbBuffer[ ulIdx ] ) & 0xFFU ) << 3U ];

                ulIdx++;
            }

            /*  Round down the length to the nearest multiple of eight.
             */
            ulSliceLen = ( ( ( ulLength - ulIdx ) >> 3U ) << 3U ) + ulIdx;

            /*  Compute the CRC in eight byte "slices".  Takes advantage of
             *  modern processors which can load in parallel from multiple
             *  memory locations.
             */
            while( ulIdx < ulSliceLen )
            {
                #if REDCONF_ENDIAN_BIG == 1
                    ulCrc32 ^= pbBuffer[ ulIdx ] | ( ( uint32_t ) pbBuffer[ ulIdx + 1U ] << 8U ) |
                               ( ( uint32_t ) pbBuffer[ ulIdx + 2U ] << 16U ) | ( ( uint32_t ) pbBuffer[ ulIdx + 3U ] << 24U );
                #else
                    ulCrc32 ^= *CAST_CONST_UINT32_PTR( &pbBuffer[ ulIdx ] );
                #endif

                ulCrc32 =
                    pulXorCrc3[ ( ( ulCrc32 >> 24U ) & 0xFFU ) << 3U ] ^
                    pulXorCrc2[ ( ( ulCrc32 >> 16U ) & 0xFFU ) << 3U ] ^
                    pulXorCrc1[ ( ( ulCrc32 >> 8U ) & 0xFFU ) << 3U ] ^
                    pulXorCrc0[ ( ulCrc32 & 0xFFU ) << 3U ] ^
                    pulXorData7[ pbBuffer[ ulIdx + 7U ] << 3U ] ^
                    pulXorData6[ pbBuffer[ ulIdx + 6U ] << 3U ] ^
                    pulXorData5[ pbBuffer[ ulIdx + 5U ] << 3U ] ^
                    pulXorData4[ pbBuffer[ ulIdx + 4U ] << 3U ];

                ulIdx += 8U;
            }

            /*  Compute the remaining bytes with the Sarwate algorithm.
             */
            while( ulIdx < ulLength )
            {
                ulCrc32 = ( ulCrc32 >> 8U ) ^ aulCrc32Table[ ( ( ulCrc32 ^ pbBuffer[ ulIdx ] ) & 0xFFU ) << 3U ];

                ulIdx++;
            }

            ulCrc32 = ~ulCrc32;
        }

        return ulCrc32;
    }

#else /* if REDCONF_CRC_ALGORITHM == CRC_BITWISE */

    #error "REDCONF_CRC_ALGORITHM must be set to CRC_BITWISE, CRC_SARWATE, or CRC_SLICEBY8"

#endif /* if REDCONF_CRC_ALGORITHM == CRC_BITWISE */


/** @brief Compute a CRC32 for a metadata node buffer.
 *
 *  @param pBuffer  The metadata node buffer for which to compute a CRC.  Must
 *                  be a block sized buffer.
 *
 *  @return The CRC of the buffer.
 */
uint32_t RedCrcNode( const void * pBuffer )
{
    uint32_t ulCrc;

    if( pBuffer == NULL )
    {
        REDERROR();
        ulCrc = SUSPICIOUS_CRC_VALUE;
    }
    else
    {
        const uint8_t * pbBuffer = CAST_VOID_PTR_TO_CONST_UINT8_PTR( pBuffer );

        /*  The first eight bytes of a metadata node contain the signature and
         *  the CRC.  There is little value in CRCing the signature, and the
         *  CRC cannot be CRC'd, so skip over that part of the buffer.
         */
        ulCrc = RedCrc32Update( 0U, &pbBuffer[ 8U ], REDCONF_BLOCK_SIZE - 8U );
    }

    return ulCrc;
}
